Audio editing apps?

[Rogerr]

Is there like an app where you can take the audio from one video and play it over another video? Kind of like what people do on vine

 

[Wabbit]

What you need is a video editor.
You rip an audio from a video using apps like Audacity or video editor might be able to do it itself.
To place that audio track in a video you need a video editor. There are simple ones like kdenlive,openshot etc or you can easily pirate professional video editors but their functionalities might confuse you.